/**
 * 时间格式化工具类
 * @author 854638
 */

var _options = {
  ZH: {
    dayNames: ['星期日', '星期一', '星期二', '星期三', '星期四', '星期五', '星期六'],
    shortDayNames: ['周日', '周一', '周二', '周三', '周四', '周五', '周六'],
    monthNames: ['一月', '二月', '三月', '四月', '五月', '六月', '七月', '八月', '九月', '十月', '十一月', '十二月'],
    shortMonthNames: ['1月', '2月', '3月', '4月', '5月', '6月', '7月', '8月', '9月', '10月', '11月', '12月']
  },
  US: {
    dayNames: ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],
    shortDayNames: ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'],
    monthNames: ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],
    shortMonthNames: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
  }
}


var _date_format_api = {

  /**
   * 格式化时间
   * @param date
   * @param fmt
   * @returns {*}
   */
  format: function (date, fmt) {
    var o = {
      'M+': date.getMonth() + 1, //月份
      'd+': date.getDate(), //日
      'h+': date.getHours(), //小时
      'm+': date.getMinutes(), //分
      's+': date.getSeconds(), //秒
      'q+': Math.floor((date.getMonth() + 3) / 3), //季度
      'S': date.getMilliseconds() //毫秒
    };
    if(!this.isNotEmpty(fmt)){
      fmt = 'yyyy-MM-dd hh:mm:ss';
    }
    if (/(y+)/.test(fmt)) {
      fmt = fmt.replace(RegExp.$1, (date.getFullYear() + '').substr(4 - RegExp.$1.length));
    }
    for (var k in o) {
      if (new RegExp('(' + k + ')').test(fmt)) {
        fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (('00' + o[k]).substr(('' + o[k]).length)));
      }
    }
    return fmt;
  },

  formatToDate: function (dateStr) {
    if(this.isNotEmpty(dateStr) ){
      return new Date(Date.parse(dateStr.replace(/-/g,   "/")));
    }
    return '';
  },

  /**
   * 得到一天的开始 date类型
   * @param date
   */
  getDateStart: function (date) {
    var fmt = 'yyyy-MM-dd';
    var dateStartStr = this.getDateStartStr(date, fmt);
    var startTime = new Date(Date.parse(dateStartStr));
    return startTime;
  },

  /**
   * 得到一天的开始 str 类型
   * @param date
   */
  getDateStartStr: function (date, fmt) {
    if (typeof fmt == 'undefined') {
      fmt = 'yyyy-MM-dd';
    }
    var dateStr = this.format(date, fmt);
    dateStr += ' 00:00:00';
    return dateStr;
  },

  /**
   * 得到一天的结束 date类型
   * @param date
   */
  getDateEnd: function (date) {
    var fmt = 'yyyy-MM-dd';
    var dateEndStr = this.getDateEndStr(date, fmt);
    var endTime = new Date(Date.parse(dateEndStr));
    return endTime;
  },

  /**
   * 得到一天的结束 str 类型
   * @param date
   */
  getDateEndStr: function (date, fmt) {
    if (typeof fmt == 'undefined') {
      fmt = 'yyyy-MM-dd';
    }
    var endStr = this.format(date, fmt);
    endStr += ' 23:59:59';
    return endStr;
  },

  /**
   * 两个时间比较大小
   * @param d1
   * @param d2
   */
  compareDate: function (d1, d2) {
    if (d1 && d2) {
      if (d1.getTime() > d2.getTime()) {
        return 1;
      } else if (d1.getTime() == d2.getTime()) {
        return 0;
      } else if (d1.getTime() < d2.getTime()) {
        return -1;
      }
    }
  },

  /**
   * 得到星期几, 支持中英
   * @param date
   * @param type
   * @returns {string}
   */
  getWeek: function (date, type) {
    if (date) {
      if (!this.isNotEmpty(type)) {
        type = 0;
      }
      var index = date.getDay();
      var dateStr = '';
      switch (type) {
        case this.WEEKTYPE.ZH_DAYNAME:
          dateStr = _options.ZH.dayNames[index];
          break;
        case this.WEEKTYPE.ZH_SDAYNAME:
          dateStr = _options.ZH.shortDayNames[index];
          break;
        case this.WEEKTYPE.US_DAYNAME:
          dateStr = _options.US.dayNames[index];
          break;
        case this.WEEKTYPE.US_SDAYNAME:
          dateStr = _options.US.shortDayNames[index];
          break;
      }
      return dateStr;
    }
  },

  /**
   * 是否为闰年
   * @param date
   * @returns {boolean}
   */
  isLeapYear: function (date) {
    if (date instanceof Date) {
      return (0 == date.getYear() % 4 && (( date.getYear() % 100 != 0) || (date.getYear() % 400 == 0)));
    }
    console.warn('argument format is wrong');
    return false;
  },

  /**
   * 字符串是否为正确的时间格式，支持 - /
   * @param dateStr
   * @returns {boolean}
   */
  isValidDate: function (dateStr) {
    if (this.isNotEmpty(dateStr)) {
      var r= dateStr.match(/^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2})$/);
      if(r==null){
        return false;
      }
      var d=new Date(r[1],r[3]-1,r[4]);
      var num = (d.getFullYear()==r[1]&&(d.getMonth()+1)==r[3]&&d.getDate()==r[4]);
      return (num!=0);
    }
  },

  /**
   * 增加天数
   * @param date
   * @param dayNum
   */
  addDay: function (date, dayNum) {
    if(this.isNotEmpty(date) && this.isNotEmpty(dayNum) && date instanceof Date && typeof dayNum == 'number'){
      date.setDate(date.getDate() + dayNum);
    }else{
      console.warn('date or dayNum format wrong');
    }
    return date;
  },

  addDayStr: function (dateStr, dayNum) {
    var date ='';
    if(this.isNotEmpty(dateStr) && this.isNotEmpty(dayNum) && typeof dayNum == 'number'){
      date = this.formatToDate(dateStr);
      date.setDate(date.getDate() + dayNum);
    }else{
      console.warn('dateStr or dayNum format wrong');
    }
    return date;
  },

  /**
   * 增加月份
   * @param date
   * @param dayNum
   */
  addMonth: function (date, monthNum) {
    if(this.isNotEmpty(date) && this.isNotEmpty(monthNum) && date instanceof Date && typeof monthNum == 'number'){
      date.setMonth(date.getMonth() + monthNum);
    }else{
      console.warn('date or monthNum format wrong');
    }
    return date;
  },

  addMonthStr: function (dateStr, monthNum) {
    var date ='';
    if(this.isNotEmpty(dateStr) && this.isNotEmpty(monthNum) && typeof monthNum == 'number'){
      date = this.formatToDate(dateStr);
      date.setMonth(date.getMonth() + monthNum);
    }else{
      console.warn('date or monthNum format wrong');
    }
    return date;
  },

  /**
   * 增加年份
   * @param date
   * @param dayNum
   */
  addYear: function (date, yearNum) {
    if(this.isNotEmpty(date) && this.isNotEmpty(yearNum) && date instanceof Date && typeof yearNum == 'number'){
      date.setYear(date.getFullYear() + yearNum);
    }else{
      console.warn('date or yearNum format wrong');
    }
    return date;
  },

  addYearStr: function (dateStr, yearNum) {
    var date = '';
    if(this.isNotEmpty(dateStr) && this.isNotEmpty(yearNum) && typeof yearNum == 'number'){
      date = this.formatToDate(dateStr);
      date.setYear(date.getFullYear() + yearNum);
    }else{
      console.warn('date or yearNum format wrong');
    }
    return date;
  },




  /**
   * 是否为空
   * @param str
   * @returns {boolean}
   */
  isNotEmpty: function (str) {
    if (str != '' && str != null && typeof str != 'undefined') {
      return true;
    }
    console.warn('argument format is wrong');
    return false;
  },

  //定义内部常量
  WEEKTYPE: {
    ZH_DAYNAME: 0,
    ZH_SDAYNAME: 1,
    US_DAYNAME: 2,
    US_SDAYNAME: 3,
  }


}

module.exports = {
  DateFormat: _date_format_api
}